How fast is a Mach 1?

The speed of Mach 1 is generally considered to be 761.2 mph, measured at sea level. Mach 1 refers to the speed of sound in air, and this speed can change depending on the temperature of the atmosph...
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How good is the Mach 4 compared to the Mach 5 and 6 on the Speed Racer cartoon and in the movie?